fix(stdio): correct log

[nadongguri]

This warning log should be corrected.

opts.log.warn('lifecycle', logid(pkg, stage), 'cannot run in wd',
  '%s %s (wd=%s)', pkg._id, pkg.scripts[stage], wd
)

[example]
npm WARN lifecycle undefined~install: cannot run in wd %s %s (wd=%s) undefined echo > .last_update /root/github/upstream/bacardi

[changed]
npm WARN lifecycle undefined~install: cannot run in wd undefined echo > .last_update (wd= /root/github/upstream/bacardi )

[zkat]

superseded by #12

[nadongguri]

Hi, Even if it's a trivial patch and it might not be better than another patch, I've been waiting for your feedback so far.
I'd like to know why my comment is deleted and if there was something that I missed in this pr based on your Contributor Guide. :)